Natural Sciences Grade 8 June 2019 Question Paper

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Downloaded from hlayiso.com GRADE 8 NATURAL SCIENCES EXAMINATION JUNE 2019 TIME: 2 HOURS MARKS____/120 NAME: INSTRUCTIONS: 1. This paper consists of 13 pages. Please check that all pages are present. 2. Use the periodic table to answer the questions in this examination 3. Answer question 1 in the spaces provided on the question paper. 4. Answer questions 2 – 4 on the lined paper provided. QUESTION 1 1.1. Various possible answers are provided for each question. Choose the best answer and write only the LETTER in the box provided. 1.1.1. 1.1.2. 1.1.3. 1.1.4. 1.1.5. 1.1.6. 1.1.7. 1.1.8. 1.1.9. 1.1.10. 1.1.1. The following bin was observed in a local Pietermaritzburg hospital. The symbol on the lid of the bin indicates that the waste inside is A. a biohazard B. an environmental hazard C. a radioactive substance D. a corrosive substance (1) 1.1.2. The safety symbol alongside illustrates a: A. biohazard B. corrosive substance C. harmful substance D. environmental hazard (1) Page 1 of 13

Downloaded from hlayiso.com 1.1.3. Which of the following safety symbols is to warn people that the material is flammable? A. B. C. D. (1) 1.1.4. Which of these elements does not react with any other elements? A. Al B. As C. Ar (1) D. At 1.1.5. Uranium is an element which is A. Radioactive and manmade B. Radioactive and solid at room temperature C. Radioactive and liquid at room temperature (1) D. Manmade and solid at room temperature 1.1.6. Which statements about a phosphorus atom are correct? 1. The nucleon number is 16. 2. The number of outer electrons is 5. 3. The proton number is 15. A. 1, 2 and 3 B. 1 and 2 only C. 1 and 3 only (1) D. 2 and 3 only Questions 1.1.7. and 1.1.8. refer to the following piece of glass apparatus. 1.1.7. The apparatus shown alongside is A. a measuring cylinder B. a burette C. a pipette D. a conical flask (1) Page 2 of 13

Downloaded from hlayiso.com 1.1.8. The reading on the apparatus is A. 16.6 cm3 B. 15.4 cm3 C. 15.3 cm3 D. 16.7 cm3 (1) Questions 1.1.9. and 1.1.10. refer to the pie charts below that show the different sources used for electricity generation in 2004 and 2014. other other 1% 2004 2% 2014 Hydro Hydro 16% 23% Coal Coal 40% 40% Nuclear Nuclear 16% 2% Gas 13% Oil Gas Oil 19% 7% 21% 1.1.9. Which forms of electricity generation have increased between 2004 & 2014? A. Gas and nuclear only B. Gas and oil C. Gas & other & nuclear D. Gas and coal (1) 1.1.10. If the World’s total electricity generation was 500 000 units, how many units were produced by coal in 2004? A. 199 000 units B. 250 000 units C. 1000 000 units (1) D. 200 000 units [10] 1.2. Write the chemical formula for four molecules of a compound consisting of lithium, carbon and oxygen in the ratio of 2:1:3. [4] ___________________________________________________________ Page 3 of 13

Downloaded from hlayiso.com 1.3. The following diagram shows an outline of the Periodic Table. The letters (A – F) shown are NOT the chemical symbols of the elements. 1. 3 . 1 . Give all the letters (A – F) of the elements that represent metals ____________________________________________ (1) 1.3.2. Write the letter (A to F) of a noble gas _____________ State the group number _______ and period number _____of this noble gas. (3) 1.3.3. Write letter (A to F) of the element that is a metalloid ____________ State the chemical name _______________and chemical symbol _______of this metalloid. (3) 1.3.4. Write the letter (A – F) of the element that is an alkaline earth metal_______ How many electrons are found in the outer energy level of this element?_____(2) [9] 1.4. Answer the following questions about laboratory apparatus. 1.4.1. What is a boss head clamp used for in the laboratory? (2) _______________________________________________________________ _______________________________________________________________ Page 4 of 13

Downloaded from hlayiso.com 1.4.2. What piece of apparatus would you use to place a small amount of a powder into a test tube? ______________________________________________________________ (1) 1.4.3. Label the TWO pieces of apparatus in the diagram below: (2) 1.4.4. You use a 25 ml pipette to transfer 25 ml of water into a beaker. You then use a 50 ml pipette to transfer 50 ml of water into the same 100 ml beaker. Draw the meniscus on the diagram of 50 the beaker to indicate the total amount of water in the beaker. (2) 1.4.5. Name ONE other piece of apparatus that you could have used to transfer this amount of water to the beaker. (1) _____________________________________________________ [8] 1.5. The following equations represent four reactions that took place when elements reacted with one another. Name the compound that will form at A, B and C. e.g. Na + O2  sodium oxide Si + Cl2  A Ca + N2  B K + Br2  C [3] Page 5 of 13

Downloaded from hlayiso.com 1.6. The structure of an atom is shown below: 1.6.1. Complete the key and complete the diagram below. (5) proton 5 (2) 1.6.2. Write a suitable heading above the diagram. [7] 1.7. Copper is a metal. Which TWO properties of metals are useful when making a copper bottom of a frying pan? _______________________________________________________________ _______________________________________________________________ [2] Page 6 of 13

Downloaded from hlayiso.com 1.8. The pie chart shows the composition of recyclable waste from a family in Pietermaritzburg. PIE CHART other 20% organic matter 30% glass and tins 10% paper 15% plastic 25% Draw a bar graph to show the data in the pie graph. [11] Page 7 of 13

Downloaded from hlayiso.com 1.9. The diagrams below show the arrangement of atoms or molecules in five different substances A, B, C, D and E. 1.9.1 Give the LETTER of the diagram which represents: (i) An element _______ (1) (ii) A mixture of elements _______ (1) (iii) A compound _______ (1) (iv) A mixture of compounds _______ (1) (v) A mixture of an element and a compound _______ (1) 1.9.2 Using the same symbols as given in the diagrams above, draw a diagram of a mixture of a diatomic element and a compound. (2) [7] Page 8 of 13

Downloaded from hlayiso.com 1.10. Use the following article and the periodic table to answer the questions below: https://iupac.org/ Elements 113, 115, 117, and 118 are now formally named Research Triangle Park, NC: On 28 November 2016, the International Union of Pure and Applied Chemistry (IUPAC) approved the name and symbols for element 113, 115, 117, and 118. Keeping with tradition, the newly discovered elements have been named after a place or geographical region, or a scientist. The name nihonium with the symbol Nh for element 113, was proposed by the discoverers at RIKEN Nishina Center (Japan); the name came from Nihon which is one of the two ways to say “Japan” in Japanese, and means “the Land of Rising Sun”. Moscovium with the symbol Mc for element 115, and tennessine with the symbol Ts for element 117, were proposed by the discoverers at various research laboratories in Russia and USA. Moscovium is in recognition of the Moscow region. Tennessine is in recognition of the contribution of the Tennessee region of the United States to superheavy element research. Lastly, the name oganesson and symbol Og for element 118, was proposed by the teams of discoverers at the various laboratories, and recognizes Professor Yuri Oganessian for his pioneering contributions to the discovery of superheavy elements. Comments from the general public were many. However, these suggestions could not be accepted, given the fact that under the current guidelines, only the discoverers have the right to propose names and symbols. 1.10.1. What is the temporary placeholder name of element 113? _______________________________________________________ (1) 1.10.2. What is the official name of element 117? _________________________ (1) 1.10.3. Identify the element that combines with calcium to form element 115 __________________________________________________________ (1) 1.10.4. What is the official name of the element that was named for a person? __________________________________________________________ (1) 1.10.5. How many protons in element 117 atoms? ________________________ (1) 1.10.6. How many neutrons in element 118 atoms? _______________________ (1) 1.10.7. How many nucleons in element 115 atoms? ______________________ (1) 1.10.8. In which period is element 113 found? ____________________________ (1) 1.10.9. Write the correct nuclear notation for element 115. (2) [10] Page 9 of 13

Downloaded from hlayiso.com ANSWER THE FOLLOWING QUESTIONS ON THE LINED PAPER PROVIDED. QUESTION 2 2.1. Study the following diagram showing zinc reacting with hydrochloric acid to produce hydrogen gas and zinc chloride. A B C 2.1.1. Name the THREE types of glass apparatus labelled A, B and C. (3) 2.1.2. Name the reactants in this experiment. (2) 2.1.3. Write the chemical formula for hydrogen gas. (2) [7] 2.2. Record the measurements shown on the thermometer below. (4) [4] Fahrenheit - Celsius Page 10 of 13

Downloaded from hlayiso.com 2.3. Study the diagram below. 2.3.1. Name the apparatus shown above. (1) 2.3.2. What is the purpose of the above apparatus? (1) 2.3.3. What other apparatus can be used for the same purpose? (1) 2.3.4. Record the measurement shown on the apparatus above. (2) [5] QUESTION 3 3.1. Study the image below which shows some elements. Draw a table to show the elements that are gases, liquids and solids at room temperature in separate columns. Br Na Xe Be Ne Hg [7] Page 11 of 13

Downloaded from hlayiso.com 3.2. Air is mostly made up of the gases, nitrogen and oxygen. Carbon dioxide makes up only a very small percentage of the air. Air also contains water that has evaporated. This gas is called water vapour. 78% Nitrogen 0,97% argon, water vapour and other gases 0,03% 21% Oxygen carbon dioxide The text boxes show the different amounts of the main gases in the air in the balloon. 3.2.1 Is air a mixture, an element or a compound? (1) 3.2.2 Give a reason for your answer in 3.2.1. (1) 3.2.3 Is carbon dioxide an element or a compound? (1) 3.2.4 Explain the reason for your answer in 3.2.3 (1) 3.2.5 Is oxygen an atom or a molecule? (1) 3.2.6 Explain the reason for your answer in 3.2.5 (1) [6] Page 12 of 13

Downloaded from hlayiso.com QUESTION 4 4.1. Observe the following diagram showing the reaction in which sulphur burns in the presence of oxygen to produce sulphur dioxide. Sulphur dioxide sulphur 4.1.1. Is this reaction endothermic or exothermic? Give a reason for your (2) answer. 4.1.2. Make ONE observation about the reaction occurring in this experiment. (1) 4.1.3. The chemical equation for the above reaction is S + O2 SO2 Write a word equation for the reaction. (3) 4.1.4. Use the following key to draw four molecules of sulphur dioxide (3) Oxygen Hydrogen Sulphur 4.1.5. State TWO ways in which the girl is correctly following lab safety procedures. In EACH case, explain what she is doing safely and why it is important. (4) [13] 4.2. Write the chemical formula for the following diagrams. KEY A. B. Carbon Hydrogen C. D. [7] Oxygen TOTAL 120 Page 13 of 13 Powered by TCPDF (www.tcpdf.org)